1 /* GStreamer Editing Services
2 * Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
3 * 2009 Nokia Corporation
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
22 * SECTION:ges-timeline
23 * @short_description: Multimedia timeline
25 * #GESTimeline is the central object for any multimedia timeline.
27 * Contains a list of #GESTimelineLayer which users should use to arrange the
28 * various timeline objects through time.
30 * The output type is determined by the #GESTrack that are set on
33 * To save/load a timeline, you can use the ges_timeline_load_from_uri() and
34 * ges_timeline_save_to_uri() methods to use the default format. If you wish
35 * to specify the format to save/load the timeline from, please consult the
36 * documentation about #GESFormatter.
39 #include "gesmarshal.h"
40 #include "ges-internal.h"
41 #include "ges-timeline.h"
42 #include "ges-track.h"
43 #include "ges-timeline-layer.h"
46 static void track_duration_cb (GstElement * track,
47 GParamSpec * arg G_GNUC_UNUSED, GESTimeline * timeline);
49 G_DEFINE_TYPE (GESTimeline, ges_timeline, GST_TYPE_BIN);
51 #define GES_TIMELINE_PENDINGOBJS_GET_LOCK(timeline) \
52 (GES_TIMELINE(timeline)->priv->pendingobjects_lock)
53 #define GES_TIMELINE_PENDINGOBJS_LOCK(timeline) \
54 (g_mutex_lock(GES_TIMELINE_PENDINGOBJS_GET_LOCK (timeline)))
55 #define GES_TIMELINE_PENDINGOBJS_UNLOCK(timeline) \
56 (g_mutex_unlock(GES_TIMELINE_PENDINGOBJS_GET_LOCK (timeline)))
58 struct _GESTimelinePrivate
60 GList *layers; /* A list of GESTimelineLayer sorted by priority */
61 GList *tracks; /* A list of private track data */
63 /* The duration of the timeline */
66 /* discoverer used for virgin sources */
67 GstDiscoverer *discoverer;
68 GList *pendingobjects;
69 /* lock to avoid discovery of objects that will be removed */
70 GMutex *pendingobjects_lock;
72 /* Whether we are changing state asynchronously or not */
73 gboolean async_pending;
76 /* private structure to contain our track-related information */
80 GESTimeline *timeline;
82 GstPad *pad; /* Pad from the track */
93 static GParamSpec *properties[PROP_LAST];
104 static GstBinClass *parent_class;
106 static guint ges_timeline_signals[LAST_SIGNAL] = { 0 };
108 static gint custom_find_track (TrackPrivate * tr_priv, GESTrack * track);
109 static GstStateChangeReturn
110 ges_timeline_change_state (GstElement * element, GstStateChange transition);
112 discoverer_finished_cb (GstDiscoverer * discoverer, GESTimeline * timeline);
114 discoverer_discovered_cb (GstDiscoverer * discoverer,
115 GstDiscovererInfo * info, GError * err, GESTimeline * timeline);
117 void look_for_transition (GESTrackObject * track_object,
118 GESTimelineLayer * layer);
119 void track_object_removed_cb (GESTrack * track, GESTrackObject * track_object,
120 GESTimeline * timeline);
123 ges_timeline_get_property (GObject * object, guint property_id,
124 GValue * value, GParamSpec * pspec)
126 GESTimeline *timeline = GES_TIMELINE (object);
128 switch (property_id) {
130 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
132 g_value_set_uint64 (value, timeline->priv->duration);
138 ges_timeline_set_property (GObject * object, guint property_id,
139 const GValue * value, GParamSpec * pspec)
141 switch (property_id) {
143 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
148 ges_timeline_dispose (GObject * object)
150 GESTimelinePrivate *priv = GES_TIMELINE (object)->priv;
152 if (priv->discoverer) {
153 gst_discoverer_stop (priv->discoverer);
154 g_object_unref (priv->discoverer);
155 priv->discoverer = NULL;
158 while (priv->layers) {
159 GESTimelineLayer *layer = (GESTimelineLayer *) priv->layers->data;
160 ges_timeline_remove_layer (GES_TIMELINE (object), layer);
163 /* FIXME: it should be possible to remove tracks before removing
164 * layers, but at the moment this creates a problem because the track
165 * objects aren't notified that their gnlobjects have been destroyed.
168 while (priv->tracks) {
169 TrackPrivate *tr_priv = (TrackPrivate *) priv->tracks->data;
170 ges_timeline_remove_track (GES_TIMELINE (object), tr_priv->track);
173 G_OBJECT_CLASS (ges_timeline_parent_class)->dispose (object);
177 ges_timeline_finalize (GObject * object)
179 GESTimeline *timeline = GES_TIMELINE (object);
181 g_mutex_free (timeline->priv->pendingobjects_lock);
183 G_OBJECT_CLASS (ges_timeline_parent_class)->finalize (object);
187 ges_timeline_class_init (GESTimelineClass * klass)
189 GObjectClass *object_class = G_OBJECT_CLASS (klass);
190 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
192 g_type_class_add_private (klass, sizeof (GESTimelinePrivate));
194 parent_class = g_type_class_peek_parent (klass);
196 element_class->change_state = ges_timeline_change_state;
198 object_class->get_property = ges_timeline_get_property;
199 object_class->set_property = ges_timeline_set_property;
200 object_class->dispose = ges_timeline_dispose;
201 object_class->finalize = ges_timeline_finalize;
204 * GESTimelineObject:duration
206 * Current duration (in nanoseconds) of the #GESTimeline
210 properties[PROP_DURATION] =
211 g_param_spec_uint64 ("duration", "Duration",
212 "The duration of the timeline", 0, G_MAXUINT64,
213 GST_CLOCK_TIME_NONE, G_PARAM_READABLE);
214 g_object_class_install_property (object_class, PROP_DURATION,
215 properties[PROP_DURATION]);
218 * GESTimeline::track-added
219 * @timeline: the #GESTimeline
220 * @track: the #GESTrack that was added to the timeline
222 * Will be emitted after the track was added to the timeline.
224 ges_timeline_signals[TRACK_ADDED] =
225 g_signal_new ("track-added", G_TYPE_FROM_CLASS (klass),
226 G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESTimelineClass, track_added), NULL,
227 NULL, ges_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GES_TYPE_TRACK);
230 * GESTimeline::track-removed
231 * @timeline: the #GESTimeline
232 * @track: the #GESTrack that was removed from the timeline
234 * Will be emitted after the track was removed from the timeline.
236 ges_timeline_signals[TRACK_REMOVED] =
237 g_signal_new ("track-removed", G_TYPE_FROM_CLASS (klass),
238 G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESTimelineClass, track_removed),
239 NULL, NULL, ges_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GES_TYPE_TRACK);
242 * GESTimeline::layer-added
243 * @timeline: the #GESTimeline
244 * @layer: the #GESTimelineLayer that was added to the timeline
246 * Will be emitted after the layer was added to the timeline.
248 ges_timeline_signals[LAYER_ADDED] =
249 g_signal_new ("layer-added", G_TYPE_FROM_CLASS (klass),
250 G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESTimelineClass, layer_added), NULL,
251 NULL, ges_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GES_TYPE_TIMELINE_LAYER);
254 * GESTimeline::layer-removed
255 * @timeline: the #GESTimeline
256 * @layer: the #GESTimelineLayer that was removed from the timeline
258 * Will be emitted after the layer was removed from the timeline.
260 ges_timeline_signals[LAYER_REMOVED] =
261 g_signal_new ("layer-removed", G_TYPE_FROM_CLASS (klass),
262 G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESTimelineClass, layer_removed),
263 NULL, NULL, ges_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
264 GES_TYPE_TIMELINE_LAYER);
268 ges_timeline_init (GESTimeline * self)
271 self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
272 GES_TYPE_TIMELINE, GESTimelinePrivate);
274 self->priv->layers = NULL;
275 self->priv->tracks = NULL;
276 self->priv->duration = 0;
278 self->priv->pendingobjects_lock = g_mutex_new ();
279 /* New discoverer with a 15s timeout */
280 self->priv->discoverer = gst_discoverer_new (15 * GST_SECOND, NULL);
281 g_signal_connect (self->priv->discoverer, "finished",
282 G_CALLBACK (discoverer_finished_cb), self);
283 g_signal_connect (self->priv->discoverer, "discovered",
284 G_CALLBACK (discoverer_discovered_cb), self);
285 gst_discoverer_start (self->priv->discoverer);
289 sort_layers (gpointer a, gpointer b)
291 GESTimelineLayer *layer_a, *layer_b;
292 guint prio_a, prio_b;
294 layer_a = GES_TIMELINE_LAYER (a);
295 layer_b = GES_TIMELINE_LAYER (b);
297 prio_a = ges_timeline_layer_get_priority (layer_a);
298 prio_b = ges_timeline_layer_get_priority (layer_b);
300 if ((gint) prio_a > (guint) prio_b)
302 if ((guint) prio_a < (guint) prio_b)
311 * Creates a new empty #GESTimeline.
313 * Returns: The new timeline.
317 ges_timeline_new (void)
319 return g_object_new (GES_TYPE_TIMELINE, NULL);
323 * ges_timeline_new_from_uri:
324 * @uri: the URI to load from
326 * Creates a timeline from the given URI.
328 * Returns: A new timeline if the uri was loaded successfully, or NULL if the
329 * uri could not be loaded
333 ges_timeline_new_from_uri (const gchar * uri)
337 /* FIXME : we should have a GError** argument so the user can know why
338 * it wasn't able to load the uri
341 ret = ges_timeline_new ();
343 if (!ges_timeline_load_from_uri (ret, uri)) {
344 g_object_unref (ret);
353 * ges_timeline_load_from_uri:
354 * @timeline: an empty #GESTimeline into which to load the formatter
355 * @uri: The URI to load from
357 * Loads the contents of URI into the given timeline.
359 * Returns: TRUE if the timeline was loaded successfully, or FALSE if the uri
360 * could not be loaded.
364 ges_timeline_load_from_uri (GESTimeline * timeline, const gchar * uri)
366 GESFormatter *p = NULL;
367 gboolean ret = FALSE;
369 /* FIXME : we should have a GError** argument so the user can know why
370 * it wasn't able to load the uri
373 if (!(p = ges_formatter_new_for_uri (uri))) {
374 GST_ERROR ("unsupported uri '%s'", uri);
378 if (!ges_formatter_load_from_uri (p, timeline, uri)) {
379 GST_ERROR ("error deserializing formatter");
392 * ges_timeline_save_to_uri:
393 * @timeline: a #GESTimeline
394 * @uri: The location to save to
396 * Saves the timeline to the given location
398 * Returns: TRUE if the timeline was successfully saved to the given location,
403 ges_timeline_save_to_uri (GESTimeline * timeline, const gchar * uri)
405 GESFormatter *p = NULL;
406 gboolean ret = FALSE;
408 /* FIXME : How will the user be able to chose the format he
409 * wishes to store to ? */
411 /* FIXME : How will we ensure a timeline loaded with a certain format
412 * will be saved with the same one by default ? We need to make this
413 * easy from an API perspective */
415 /* FIXME : we should have a GError** argument so the user can know why
416 * it wasn't able to save
419 if (!(p = ges_formatter_new_for_uri (uri))) {
420 GST_ERROR ("unsupported uri '%s'", uri);
424 if (!ges_formatter_save_to_uri (p, timeline, uri)) {
425 GST_ERROR ("error serializing formatter");
438 add_object_to_track (GESTimelineObject * object, GESTrack * track)
440 if (!ges_timeline_object_create_track_objects (object, track)) {
441 GST_WARNING ("error creating track objects");
446 add_object_to_tracks (GESTimeline * timeline, GESTimelineObject * object)
450 for (tmp = timeline->priv->tracks; tmp; tmp = g_list_next (tmp)) {
451 TrackPrivate *tr_priv = (TrackPrivate *) tmp->data;
452 GESTrack *track = tr_priv->track;
454 GST_LOG ("Trying with track %p", track);
455 add_object_to_track (object, track);
461 do_async_start (GESTimeline * timeline)
466 timeline->priv->async_pending = TRUE;
468 /* Freeze state of tracks */
469 for (tmp = timeline->priv->tracks; tmp; tmp = tmp->next) {
470 TrackPrivate *tr_priv = (TrackPrivate *) tmp->data;
471 gst_element_set_locked_state ((GstElement *) tr_priv->track, TRUE);
474 message = gst_message_new_async_start (GST_OBJECT_CAST (timeline), FALSE);
475 parent_class->handle_message (GST_BIN_CAST (timeline), message);
479 do_async_done (GESTimeline * timeline)
483 if (timeline->priv->async_pending) {
485 /* Unfreeze state of tracks */
486 for (tmp = timeline->priv->tracks; tmp; tmp = tmp->next) {
487 TrackPrivate *tr_priv = (TrackPrivate *) tmp->data;
488 gst_element_set_locked_state ((GstElement *) tr_priv->track, FALSE);
489 gst_element_sync_state_with_parent ((GstElement *) tr_priv->track);
492 GST_DEBUG_OBJECT (timeline, "Emitting async-done");
493 message = gst_message_new_async_done (GST_OBJECT_CAST (timeline));
494 parent_class->handle_message (GST_BIN_CAST (timeline), message);
496 timeline->priv->async_pending = FALSE;
501 discoverer_finished_cb (GstDiscoverer * discoverer, GESTimeline * timeline)
503 do_async_done (timeline);
507 discoverer_discovered_cb (GstDiscoverer * discoverer,
508 GstDiscovererInfo * info, GError * err, GESTimeline * timeline)
511 gboolean found = FALSE;
512 gboolean is_image = FALSE;
513 GESTimelineFileSource *tfs = NULL;
514 GESTimelinePrivate *priv = timeline->priv;
515 const gchar *uri = gst_discoverer_info_get_uri (info);
519 GST_WARNING ("Error while discovering %s: %s", uri, err->message);
522 GST_DEBUG ("Discovered uri %s", uri);
524 GES_TIMELINE_PENDINGOBJS_LOCK (timeline);
526 /* Find corresponding TimelineFileSource in the sources */
527 for (tmp = priv->pendingobjects; tmp; tmp = tmp->next) {
528 tfs = (GESTimelineFileSource *) tmp->data;
530 if (!g_strcmp0 (ges_timeline_filesource_get_uri (tfs), uri)) {
538 GESTrackType tfs_supportedformats;
540 /* The timeline file source will be updated with discovered information
541 * so it needs to not be finalized during this process */
544 /* Remove object from list */
545 priv->pendingobjects = g_list_delete_link (priv->pendingobjects, tmp);
546 GES_TIMELINE_PENDINGOBJS_UNLOCK (timeline);
548 /* FIXME : Handle errors in discovery */
549 stream_list = gst_discoverer_info_get_stream_list (info);
551 tfs_supportedformats = ges_timeline_filesource_get_supported_formats (tfs);
552 if (tfs_supportedformats != GES_TRACK_TYPE_UNKNOWN)
555 /* Update timelinefilesource properties based on info */
556 for (tmp = stream_list; tmp; tmp = tmp->next) {
557 GstDiscovererStreamInfo *sinf = (GstDiscovererStreamInfo *) tmp->data;
559 if (GST_IS_DISCOVERER_AUDIO_INFO (sinf)) {
560 tfs_supportedformats |= GES_TRACK_TYPE_AUDIO;
561 ges_timeline_filesource_set_supported_formats (tfs,
562 tfs_supportedformats);
563 } else if (GST_IS_DISCOVERER_VIDEO_INFO (sinf)) {
564 tfs_supportedformats |= GES_TRACK_TYPE_VIDEO;
565 ges_timeline_filesource_set_supported_formats (tfs,
566 tfs_supportedformats);
567 if (gst_discoverer_video_info_is_image ((GstDiscovererVideoInfo *)
569 tfs_supportedformats |= GES_TRACK_TYPE_AUDIO;
570 ges_timeline_filesource_set_supported_formats (tfs,
571 tfs_supportedformats);
578 gst_discoverer_stream_info_list_free (stream_list);
583 /* don't set max-duration on still images */
584 g_object_set (tfs, "is_image", (gboolean) TRUE, NULL);
587 /* Continue the processing on tfs */
588 add_object_to_tracks (timeline, GES_TIMELINE_OBJECT (tfs));
591 g_object_set (tfs, "max-duration",
592 gst_discoverer_info_get_duration (info), NULL);
595 /* Continue the processing on tfs */
596 add_object_to_tracks (timeline, GES_TIMELINE_OBJECT (tfs));
598 /* Remove the ref as the timeline file source is no longer needed here */
599 g_object_unref (tfs);
601 GES_TIMELINE_PENDINGOBJS_UNLOCK (timeline);
605 static GstStateChangeReturn
606 ges_timeline_change_state (GstElement * element, GstStateChange transition)
608 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
609 GESTimeline *timeline = GES_TIMELINE (element);
611 switch (transition) {
612 case GST_STATE_CHANGE_READY_TO_PAUSED:
613 GES_TIMELINE_PENDINGOBJS_LOCK (timeline);
614 if (timeline->priv->pendingobjects) {
615 GES_TIMELINE_PENDINGOBJS_UNLOCK (timeline);
616 do_async_start (timeline);
617 ret = GST_STATE_CHANGE_ASYNC;
619 GES_TIMELINE_PENDINGOBJS_UNLOCK (timeline);
627 GstStateChangeReturn bret;
629 bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
630 if (G_UNLIKELY (bret == GST_STATE_CHANGE_NO_PREROLL)) {
631 do_async_done (timeline);
636 switch (transition) {
637 case GST_STATE_CHANGE_PAUSED_TO_READY:
638 do_async_done (timeline);
649 layer_object_added_cb (GESTimelineLayer * layer, GESTimelineObject * object,
650 GESTimeline * timeline)
652 if (ges_timeline_object_is_moving_from_layer (object)) {
653 GST_DEBUG ("TimelineObject %p is moving from a layer to another, not doing"
654 " anything on it", object);
658 GST_DEBUG ("New TimelineObject %p added to layer %p", object, layer);
660 if (GES_IS_TIMELINE_FILE_SOURCE (object)) {
661 GESTimelineFileSource *tfs = GES_TIMELINE_FILE_SOURCE (object);
662 GESTrackType tfs_supportedformats =
663 ges_timeline_filesource_get_supported_formats (tfs);
664 guint64 tfs_maxdur = ges_timeline_filesource_get_max_duration (tfs);
665 const gchar *tfs_uri;
667 /* Send the filesource to the discoverer if:
668 * * it doesn't have specified supported formats
669 * * OR it doesn't have a specified max-duration
670 * * OR it doesn't have a valid duration */
672 if (tfs_supportedformats == GES_TRACK_TYPE_UNKNOWN ||
673 tfs_maxdur == GST_CLOCK_TIME_NONE || object->duration == 0) {
674 GST_LOG ("Incomplete TimelineFileSource, discovering it");
675 tfs_uri = ges_timeline_filesource_get_uri (tfs);
677 GES_TIMELINE_PENDINGOBJS_LOCK (timeline);
678 timeline->priv->pendingobjects =
679 g_list_append (timeline->priv->pendingobjects, object);
680 GES_TIMELINE_PENDINGOBJS_UNLOCK (timeline);
682 gst_discoverer_discover_uri_async (timeline->priv->discoverer, tfs_uri);
684 add_object_to_tracks (timeline, object);
686 add_object_to_tracks (timeline, object);
693 layer_priority_changed_cb (GESTimelineLayer * layer,
694 GParamSpec * arg G_GNUC_UNUSED, GESTimeline * timeline)
696 timeline->priv->layers = g_list_sort (timeline->priv->layers, (GCompareFunc)
701 layer_object_removed_cb (GESTimelineLayer * layer, GESTimelineObject * object,
702 GESTimeline * timeline)
704 GList *trackobjects, *tmp;
706 if (ges_timeline_object_is_moving_from_layer (object)) {
707 GST_DEBUG ("TimelineObject %p is moving from a layer to another, not doing"
708 " anything on it", object);
712 GST_DEBUG ("TimelineObject %p removed from layer %p", object, layer);
714 /* Go over the object's track objects and figure out which one belongs to
715 * the list of tracks we control */
717 trackobjects = ges_timeline_object_get_track_objects (object);
718 for (tmp = trackobjects; tmp; tmp = tmp->next) {
719 GESTrackObject *trobj = (GESTrackObject *) tmp->data;
721 GST_DEBUG ("Trying to remove TrackObject %p", trobj);
722 if (G_LIKELY (g_list_find_custom (timeline->priv->tracks,
723 ges_track_object_get_track (trobj),
724 (GCompareFunc) custom_find_track))) {
725 GST_DEBUG ("Belongs to one of the tracks we control");
726 ges_track_remove_object (ges_track_object_get_track (trobj), trobj);
728 ges_timeline_object_release_track_object (object, trobj);
730 /* removing the reference added by _get_track_objects() */
731 g_object_unref (trobj);
734 g_list_free (trackobjects);
736 /* if the object is a timeline file source that has not yet been discovered,
737 * it no longer needs to be discovered so remove it from the pendingobjects
738 * list if it belongs to this layer */
739 if (GES_IS_TIMELINE_FILE_SOURCE (object)) {
740 GES_TIMELINE_PENDINGOBJS_LOCK (timeline);
741 timeline->priv->pendingobjects =
742 g_list_remove_all (timeline->priv->pendingobjects, object);
743 GES_TIMELINE_PENDINGOBJS_UNLOCK (timeline);
750 * ges_timeline_append_layer:
751 * @timeline: a #GESTimeline
752 * @layer: the #GESTimelineLayer to add
754 * Convenience method to append @layer to @timeline which means that the
755 * priority of @layer is changed to correspond to the last layer of @timeline.
756 * The reference to the @layer will be stolen by @timeline.
758 * Returns: TRUE if the layer was properly added, else FALSE.
761 ges_timeline_append_layer (GESTimeline * timeline, GESTimelineLayer * layer)
764 GESTimelinePrivate *priv = timeline->priv;
766 GST_DEBUG ("Appending layer to layer:%p, timeline:%p", timeline, layer);
767 priority = g_list_length (priv->layers);
769 ges_timeline_layer_set_priority (layer, priority);
771 return ges_timeline_add_layer (timeline, layer);
775 * ges_timeline_add_layer:
776 * @timeline: a #GESTimeline
777 * @layer: the #GESTimelineLayer to add
779 * Add the layer to the timeline. The reference to the @layer will be stolen
782 * Returns: TRUE if the layer was properly added, else FALSE.
785 ges_timeline_add_layer (GESTimeline * timeline, GESTimelineLayer * layer)
787 GList *objects, *tmp;
788 GESTimelinePrivate *priv = timeline->priv;
790 GST_DEBUG ("timeline:%p, layer:%p", timeline, layer);
792 /* We can only add a layer that doesn't already belong to another timeline */
793 if (G_UNLIKELY (layer->timeline)) {
794 GST_WARNING ("Layer belongs to another timeline, can't add it");
798 /* Add to the list of layers, make sure we don't already control it */
799 if (G_UNLIKELY (g_list_find (priv->layers, (gconstpointer) layer))) {
800 GST_WARNING ("Layer is already controlled by this timeline");
804 g_object_ref_sink (layer);
805 priv->layers = g_list_insert_sorted (priv->layers, layer,
806 (GCompareFunc) sort_layers);
808 /* Inform the layer that it belongs to a new timeline */
809 ges_timeline_layer_set_timeline (layer, timeline);
811 /* Connect to 'object-added'/'object-removed' signal from the new layer */
812 g_signal_connect (layer, "object-added", G_CALLBACK (layer_object_added_cb),
814 g_signal_connect (layer, "object-removed",
815 G_CALLBACK (layer_object_removed_cb), timeline);
816 g_signal_connect (layer, "notify::priority",
817 G_CALLBACK (layer_priority_changed_cb), timeline);
819 GST_DEBUG ("Done adding layer, emitting 'layer-added' signal");
820 g_signal_emit (timeline, ges_timeline_signals[LAYER_ADDED], 0, layer);
822 /* add any existing timeline objects to the timeline */
823 objects = ges_timeline_layer_get_objects (layer);
824 for (tmp = objects; tmp; tmp = tmp->next) {
825 layer_object_added_cb (layer, tmp->data, timeline);
826 g_object_unref (tmp->data);
829 g_list_free (objects);
835 * ges_timeline_remove_layer:
836 * @timeline: a #GESTimeline
837 * @layer: the #GESTimelineLayer to remove
839 * Removes the layer from the timeline. The reference that the @timeline holds on
840 * the layer will be dropped. If you wish to use the @layer after calling this
841 * method, you need to take a reference before calling.
843 * Returns: TRUE if the layer was properly removed, else FALSE.
847 ges_timeline_remove_layer (GESTimeline * timeline, GESTimelineLayer * layer)
849 GList *layer_objects, *tmp;
850 GESTimelinePrivate *priv = timeline->priv;
852 GST_DEBUG ("timeline:%p, layer:%p", timeline, layer);
854 if (G_UNLIKELY (!g_list_find (priv->layers, layer))) {
855 GST_WARNING ("Layer doesn't belong to this timeline");
859 /* remove objects from any private data structures */
861 layer_objects = ges_timeline_layer_get_objects (layer);
862 for (tmp = layer_objects; tmp; tmp = tmp->next) {
863 layer_object_removed_cb (layer, GES_TIMELINE_OBJECT (tmp->data), timeline);
864 g_object_unref (G_OBJECT (tmp->data));
867 g_list_free (layer_objects);
869 /* Disconnect signals */
870 GST_DEBUG ("Disconnecting signal callbacks");
871 g_signal_handlers_disconnect_by_func (layer, layer_object_added_cb, timeline);
872 g_signal_handlers_disconnect_by_func (layer, layer_object_removed_cb,
875 priv->layers = g_list_remove (priv->layers, layer);
877 ges_timeline_layer_set_timeline (layer, NULL);
879 g_signal_emit (timeline, ges_timeline_signals[LAYER_REMOVED], 0, layer);
881 g_object_unref (layer);
887 pad_added_cb (GESTrack * track, GstPad * pad, TrackPrivate * tr_priv)
892 GST_DEBUG ("track:%p, pad:%s:%s", track, GST_DEBUG_PAD_NAME (pad));
894 if (G_UNLIKELY (tr_priv->pad)) {
895 GST_WARNING ("We are already controlling a pad for this track");
899 /* Remember the pad */
903 GST_DEBUG ("Ghosting pad and adding it to ourself");
904 padname = g_strdup_printf ("track_%p_src", track);
905 tr_priv->ghostpad = gst_ghost_pad_new (padname, pad);
907 gst_pad_set_active (tr_priv->ghostpad, TRUE);
908 gst_element_add_pad (GST_ELEMENT (tr_priv->timeline), tr_priv->ghostpad);
912 pad_removed_cb (GESTrack * track, GstPad * pad, TrackPrivate * tr_priv)
914 GST_DEBUG ("track:%p, pad:%s:%s", track, GST_DEBUG_PAD_NAME (pad));
916 if (G_UNLIKELY (tr_priv->pad != pad)) {
917 GST_WARNING ("Not the pad we're controlling");
921 if (G_UNLIKELY (tr_priv->ghostpad == NULL)) {
922 GST_WARNING ("We don't have a ghostpad for this pad !");
926 GST_DEBUG ("Removing ghostpad");
927 gst_pad_set_active (tr_priv->ghostpad, FALSE);
928 gst_element_remove_pad (GST_ELEMENT (tr_priv->timeline), tr_priv->ghostpad);
929 tr_priv->ghostpad = NULL;
934 custom_find_track (TrackPrivate * tr_priv, GESTrack * track)
936 if (tr_priv->track == track)
942 * ges_timeline_add_track:
943 * @timeline: a #GESTimeline
944 * @track: the #GESTrack to add
946 * Add a track to the timeline. The reference to the track will be stolen by the
949 * Returns: TRUE if the track was properly added, else FALSE.
952 /* FIXME: create track objects for timeline objects which have already been
953 * added to existing layers.
957 ges_timeline_add_track (GESTimeline * timeline, GESTrack * track)
959 TrackPrivate *tr_priv;
960 GESTimelinePrivate *priv = timeline->priv;
963 GST_DEBUG ("timeline:%p, track:%p", timeline, track);
965 /* make sure we don't already control it */
966 if (G_UNLIKELY (g_list_find_custom (priv->tracks, (gconstpointer) track,
967 (GCompareFunc) custom_find_track))) {
968 GST_WARNING ("Track is already controlled by this timeline");
972 /* Add the track to ourself (as a GstBin)
973 * Reference is stolen ! */
974 if (G_UNLIKELY (!gst_bin_add (GST_BIN (timeline), GST_ELEMENT (track)))) {
975 GST_WARNING ("Couldn't add track to ourself (GST)");
979 tr_priv = g_new0 (TrackPrivate, 1);
980 tr_priv->timeline = timeline;
981 tr_priv->track = track;
983 /* Add the track to the list of tracks we track */
984 priv->tracks = g_list_append (priv->tracks, tr_priv);
986 /* Listen to pad-added/-removed */
987 g_signal_connect (track, "pad-added", (GCallback) pad_added_cb, tr_priv);
988 g_signal_connect (track, "pad-removed", (GCallback) pad_removed_cb, tr_priv);
990 /* Inform the track that it's currently being used by ourself */
991 ges_track_set_timeline (track, timeline);
993 GST_DEBUG ("Done adding track, emitting 'track-added' signal");
995 /* emit 'track-added' */
996 g_signal_emit (timeline, ges_timeline_signals[TRACK_ADDED], 0, track);
998 /* ensure that each existing timeline object has the opportunity to create a
999 * track object for this track*/
1001 for (tmp = priv->layers; tmp; tmp = tmp->next) {
1002 GList *objects, *obj;
1003 objects = ges_timeline_layer_get_objects (tmp->data);
1005 for (obj = objects; obj; obj = obj->next) {
1006 add_object_to_track (obj->data, track);
1007 g_object_unref (obj->data);
1010 g_list_free (objects);
1013 /* We connect to the duration change notify, so we can update
1014 * our duration accordingly */
1015 g_signal_connect (G_OBJECT (track), "notify::duration",
1016 G_CALLBACK (track_duration_cb), timeline);
1017 track_duration_cb (GST_ELEMENT (track), NULL, timeline);
1023 * ges_timeline_remove_track:
1024 * @timeline: a #GESTimeline
1025 * @track: the #GESTrack to remove
1027 * Remove the @track from the @timeline. The reference stolen when adding the
1028 * @track will be removed. If you wish to use the @track after calling this
1029 * function you must ensure that you have a reference to it.
1031 * Returns: TRUE if the @track was properly removed, else FALSE.
1034 /* FIXME: release any track objects associated with this layer. currenly this
1035 * will not happen if you remove the track before removing *all*
1036 * timelineobjects which have a track object in this track.
1040 ges_timeline_remove_track (GESTimeline * timeline, GESTrack * track)
1043 TrackPrivate *tr_priv;
1044 GESTimelinePrivate *priv = timeline->priv;
1046 GST_DEBUG ("timeline:%p, track:%p", timeline, track);
1048 if (G_UNLIKELY (!(tmp =
1049 g_list_find_custom (priv->tracks, (gconstpointer) track,
1050 (GCompareFunc) custom_find_track)))) {
1051 GST_WARNING ("Track doesn't belong to this timeline");
1055 tr_priv = tmp->data;
1056 priv->tracks = g_list_remove (priv->tracks, tr_priv);
1058 ges_track_set_timeline (track, NULL);
1060 /* Remove ghost pad */
1061 if (tr_priv->ghostpad) {
1062 GST_DEBUG ("Removing ghostpad");
1063 gst_pad_set_active (tr_priv->ghostpad, FALSE);
1064 gst_ghost_pad_set_target ((GstGhostPad *) tr_priv->ghostpad, NULL);
1065 gst_element_remove_pad (GST_ELEMENT (timeline), tr_priv->ghostpad);
1068 /* Remove pad-added/-removed handlers */
1069 g_signal_handlers_disconnect_by_func (track, pad_added_cb, tr_priv);
1070 g_signal_handlers_disconnect_by_func (track, pad_removed_cb, tr_priv);
1071 g_signal_handlers_disconnect_by_func (track, track_duration_cb,
1074 /* Signal track removal to all layers/objects */
1075 g_signal_emit (timeline, ges_timeline_signals[TRACK_REMOVED], 0, track);
1077 /* remove track from our bin */
1078 gst_object_ref (track);
1079 if (G_UNLIKELY (!gst_bin_remove (GST_BIN (timeline), GST_ELEMENT (track)))) {
1080 GST_WARNING ("Couldn't remove track to ourself (GST)");
1081 gst_object_unref (track);
1085 /* set track state to NULL */
1087 gst_element_set_state (GST_ELEMENT (track), GST_STATE_NULL);
1089 gst_object_unref (track);
1097 * ges_timeline_get_track_for_pad:
1098 * @timeline: The #GESTimeline
1101 * Search the #GESTrack corresponding to the given @timeline's @pad.
1103 * Returns: (transfer none): The corresponding #GESTrack if it is found,
1104 * or %NULL if there is an error.
1108 ges_timeline_get_track_for_pad (GESTimeline * timeline, GstPad * pad)
1112 for (tmp = timeline->priv->tracks; tmp; tmp = g_list_next (tmp)) {
1113 TrackPrivate *tr_priv = (TrackPrivate *) tmp->data;
1114 if (pad == tr_priv->ghostpad)
1115 return tr_priv->track;
1122 * ges_timeline_get_tracks:
1123 * @timeline: a #GESTimeline
1125 * Returns the list of #GESTrack used by the Timeline.
1127 * Returns: (transfer full) (element-type GESTrack): A list of #GESTrack.
1128 * The caller should unref each track once he is done with them.
1131 ges_timeline_get_tracks (GESTimeline * timeline)
1133 GList *tmp, *res = NULL;
1135 for (tmp = timeline->priv->tracks; tmp; tmp = g_list_next (tmp)) {
1136 TrackPrivate *tr_priv = (TrackPrivate *) tmp->data;
1137 res = g_list_append (res, g_object_ref (tr_priv->track));
1144 * ges_timeline_get_layers:
1145 * @timeline: a #GESTimeline
1147 * Get the list of #GESTimelineLayer present in the Timeline.
1149 * Returns: (transfer full) (element-type GESTimelineLayer): the list of
1150 * #GESTimelineLayer present in the Timeline sorted by priority.
1151 * The caller should unref each Layer once he is done with them.
1154 ges_timeline_get_layers (GESTimeline * timeline)
1156 GList *tmp, *res = NULL;
1158 for (tmp = timeline->priv->layers; tmp; tmp = g_list_next (tmp)) {
1159 res = g_list_insert_sorted (res, g_object_ref (tmp->data),
1160 (GCompareFunc) sort_layers);
1167 * ges_timeline_enable_update:
1168 * @timeline: a #GESTimeline
1169 * @enabled: TRUE if the timeline must be updated, FALSE otherwise.
1171 * Calls the enable_update function of the tracks contained by the timeline.
1173 * Returns: True if success, FALSE otherwise.
1176 ges_timeline_enable_update (GESTimeline * timeline, gboolean enabled)
1178 GList *tmp, *tracks;
1179 gboolean res = TRUE;
1181 GST_DEBUG_OBJECT (timeline, "%s updates", enabled ? "Enabling" : "Disabling");
1183 tracks = ges_timeline_get_tracks (timeline);
1185 for (tmp = tracks; tmp; tmp = tmp->next) {
1186 if (!ges_track_enable_update (tmp->data, enabled)) {
1191 g_list_free (tracks);
1197 track_duration_cb (GstElement * track,
1198 GParamSpec * arg G_GNUC_UNUSED, GESTimeline * timeline)
1200 guint64 duration, max_duration = 0;
1203 for (tmp = timeline->priv->tracks; tmp; tmp = g_list_next (tmp)) {
1204 TrackPrivate *tr_priv = (TrackPrivate *) tmp->data;
1205 g_object_get (tr_priv->track, "duration", &duration, NULL);
1206 GST_DEBUG ("track duration : %" GST_TIME_FORMAT, GST_TIME_ARGS (duration));
1207 max_duration = MAX (duration, max_duration);
1210 if (timeline->priv->duration != max_duration) {
1211 GST_DEBUG ("track duration : %" GST_TIME_FORMAT " current : %"
1212 GST_TIME_FORMAT, GST_TIME_ARGS (max_duration),
1213 GST_TIME_ARGS (timeline->priv->duration));
1215 timeline->priv->duration = max_duration;
1217 #if GLIB_CHECK_VERSION(2,26,0)
1218 g_object_notify_by_pspec (G_OBJECT (timeline), properties[PROP_DURATION]);
1220 g_object_notify (G_OBJECT (timeline), "duration");